Abstract
In this study, the corrosion behavior of Ni47Ti49Co4 shape memory alloy (SMA) was investigated in simulated saliva solution with the binary alloy Ni51Ti49 as a reference. The surface morphology and the chemical composition of the oxide films were characterized by scanning electron microscopy and X-ray photoelectron spectroscopy before and after immersion in the test solutions, respectively. The results showed that the ternary alloy was less affected by the test solution, owning to the formation of passive layer composed mainly of the oxides of titanium and cobalt in several oxidation states. Cyclic voltammetry, electrochemical impedance spectroscopy and potentiodynamic polarization measurements affirmed that the passive oxide film significantly improved the corrosion resistance of Ni47Ti49Co4 SMAs as demonstrated by the smaller corrosion current density, larger resistance and smaller capacitance. Consequently, alloying with cobalt, which has paramount importance in enhancing the passive layer, expands the use of Ni47Ti49Co4 SMAs in dental work as new nitinol alloys with high corrosion resistances.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1001-1010 |
| Number of pages | 10 |
| Journal | ACTA METALLURGICA SINICA-ENGLISH LETTERS |
| Volume | 29 |
| Issue number | 11 |
| DOIs | |
| State | Published - Jul 21 2016 |
| Externally published | Yes |
Bibliographical note
KAUST Repository Item: Exported on 2022-06-02Acknowledgements: The author is grateful for the financial support of Chemistry Department (Taif University, Saudi Arabia). The author would like to thank Core labs in King Abdullah University of Science and Technology (KAUST) for performing SEM and XPS analysis.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.